[Galaxy Tab  Android Development] Technomancer:
Hi guys

I have been investigating making serial cable for Tab for debugging and logging.

There is serial port wired to 30 pin connector.

Here is the pinout for the connector (copied from Wikipedia, unfortunately some asshole deleted it from Wikipedia several days ago)

Pin	Signal	to/from device
1	Gnd	P
2	Gnd	P
3	USB_DP_CON	I/O
4	USB_DM_CON	I/O
5	IF_CON_SENSE	I
6	V_ACCESSORY_5.0V	P
7	V_BUS_1	P
8	V_BUS_1	P
9	VOUT_CHARGER	P
10	VOUT_CHARGER	P
11	---	--
12	---	--
13	ACCESSORY_ID / USB_ID	I
14	ACCESSORY_INT	I
15	Gnd	P
16	Gnd	P
17	MHL_DP	I/O
18	MHL_DM	I/O
19	MHL_ID	I
20	IF_RXD	I
21	IF_TXD	O
22	---	--
23	AP_TV_OUT	O
24	REMOTE_SENSE	I
25	---	--
26	---	--
27	EAR_L_CRADLE	O
28	EAR_R_CRADLE	O
29	3.5_INT_TEST	I
30	Gnd	P

The serial port is connected to ttySAC2 (port 2, 0 based)

So we need:

USB to low power serial adapter (repurposed knockoff Nokia DKU-5 cable)

Galaxy Tab USB cable.

Soldering skills and magnifying glass.

Brass balls.

We disassemble the Tab USB cable. There are several blades in the connector. We have to remove 2 blades with USB power and 2 blades for USB D+ D-.

Then we cut the Nokia connector off DKU-5 cable and figure out which wires are GND, TXD and RXD.

In case of my cable with ARK3116 red - GND, grn - RXD, wht - TXD

In case of my cable with PL2303 blu - GND, wht - RXD, ylo - TXD

We want to connect GND to GND, and RXD to pin 21 and TXD to pin 20

This is a good article on hacking DKU-5 cables http://www.neolics.com/pdfs/dku-5.pdf

So now we can solder the GND, TXD and RXD to proper blades on 30 pin connector and insert TXD and RXD blades into slots 20,21 on the connector.

I also tried using 200K trimmer set to 150K ohm between ACCESSORY_ID and GND but I am not sure whether it is the right solution.

Here are some photos:

And some output from bootloader: http://pastie.org/1712603

And in download mode http://pastie.org/1721484

This is the table of resistances from kernel in arch/arm/mach-s5pv210/include/mach/fsa9480_i2c.h

typedef enum
{
RID_USB_OTG_MODE, /* 0 0 0 0 0 GND USB OTG Mode */
RID_AUD_SEND_END_BTN, /* 0 0 0 0 1 2K Audio Send_End Button*/
RID_AUD_REMOTE_S1_BTN, /* 0 0 0 1 0 2.604K Audio Remote S1 Button */
RID_AUD_REMOTE_S2_BTN, /* 0 0 0 1 1 3.208K Audio Remote S2 Button */
RID_AUD_REMOTE_S3_BTN, /* 0 0 1 0 0 4.014K Audio Remote S3 Button */
RID_AUD_REMOTE_S4_BTN, /* 0 0 1 0 1 4.82K Audio Remote S4 Button */
RID_AUD_REMOTE_S5_BTN, /* 0 0 1 1 0 6.03K Audio Remote S5 Button */
RID_AUD_REMOTE_S6_BTN, /* 0 0 1 1 1 8.03K Audio Remote S6 Button */
RID_AUD_REMOTE_S7_BTN, /* 0 1 0 0 0 10.03K Audio Remote S7 Button */
RID_AUD_REMOTE_S8_BTN, /* 0 1 0 0 1 12.03K Audio Remote S8 Button */
RID_AUD_REMOTE_S9_BTN, /* 0 1 0 1 0 14.46K Audio Remote S9 Button */
RID_AUD_REMOTE_S10_BTN, /* 0 1 0 1 1 17.26K Audio Remote S10 Button */
RID_AUD_REMOTE_S11_BTN, /* 0 1 1 0 0 20.5K Audio Remote S11 Button */
RID_AUD_REMOTE_S12_BTN, /* 0 1 1 0 1 24.07K Audio Remote S12 Button */
RID_RESERVED_1, /* 0 1 1 1 0 28.7K Reserved Accessory #1 */
RID_RESERVED_2, /* 0 1 1 1 1 34K Reserved Accessory #2 */
RID_RESERVED_3, /* 1 0 0 0 0 40.2K Reserved Accessory #3 */
RID_RESERVED_4, /* 1 0 0 0 1 49.9K Reserved Accessory #4 */
RID_RESERVED_5, /* 1 0 0 1 0 64.9K Reserved Accessory #5 */
RID_AUD_DEV_TY_2, /* 1 0 0 1 1 80.07K Audio Device Type 2 */
RID_PHONE_PWD_DEV, /* 1 0 1 0 0 102K Phone Powered Device */
RID_TTY_CONVERTER, /* 1 0 1 0 1 121K TTY Converter */
RID_UART_CABLE, /* 1 0 1 1 0 150K UART Cable */
RID_CEA936A_TY_1, /* 1 0 1 1 1 200K CEA936A Type-1 Charger(1) */
RID_FM_BOOT_OFF_USB, /* 1 1 0 0 0 255K Factory Mode Boot OFF-USB */
RID_FM_BOOT_ON_USB, /* 1 1 0 0 1 301K Factory Mode Boot ON-USB */
RID_AUD_VDO_CABLE, /* 1 1 0 1 0 365K Audio/Video Cable */
RID_CEA936A_TY_2, /* 1 1 0 1 1 442K CEA936A Type-2 Charger(1) */
RID_FM_BOOT_OFF_UART, /* 1 1 1 0 0 523K Factory Mode Boot OFF-UART */
RID_FM_BOOT_ON_UART, /* 1 1 1 0 1 619K Factory Mode Boot ON-UART */
RID_AUD_DEV_TY_1_REMOTE, /* 1 1 1 1 0 1000.07K Audio Device Type 1 with Remote(1) */
RID_AUD_DEV_TY_1_SEND = RID_AUD_DEV_TY_1_REMOTE , /* 1 1 1 1 0 1002K Audio Device Type 1 / Only Send-End(2) */
RID_USB_MODE, /* 1 1 1 1 1 Open USB Mode, Dedicated Charger or Accessory Detach */
RID_MAX

}FSA9480_RID_ENUM_TYPE;